WFU Physics Lecture Demonstrations

Hinged Stick

PIRA 1Q20.50

Image:

Description:

A ball is resting on a peg at the top of a slat that
is propped up by a stick. When the stick is snatched from under the slat,
the "chimney" falls and the ball lands in a cup attached to
the slat. The torque extered on the hinge by the weight of the top slat
causes the "chimney" to fall faster than g, allowing the ball
to be caught.